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A092297 as a simple table

n a(n)
1 0
2 6
3 6
4 18
5 30
6 66
7 126
8 258
9 510
10 1026
11 2046
12 4098
13 8190
14 16386
15 32766
16 65538
17 131070
18 262146
19 524286
20 1048578
21 2097150
22 4194306
23 8388606
24 16777218
25 33554430
26 67108866
27 134217726
28 268435458
29 536870910
30 1073741826
31 2147483646

[0,6,6,18,30,66,126,258,510,1026,2046,4098,8190,
 16386,32766,65538,131070,262146,524286,1048578,
 2097150,4194306,8388606,16777218,33554430,
 67108866,134217726,268435458,536870910,1073741826,
 2147483646]

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Last modified March 30 15:42 EDT 2020. Contains 333127 sequences. (Running on oeis4.)